Jack rides a bicycle northward at 12 mph. Jill rides southward on the same road at 12 mph. As they pass each other
A) their speeds are identical and their velocities are identical.
B) their speeds are identical but their velocities are different.
C) their speeds are different but their velocities are identical.
D) their speeds are different and their velocities are different.
E) theoretical physics predicts, surprisingly enough, that they will turn into giant frogs.
B
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For radio reception in city buildings, diffraction is
A) helpful. B) a hindrance. C) not a factor.
A protogalactic cloud with very little angular momentum is more likely to form an elliptical galaxy than a spiral galaxy
Indicate whether the statement is true or false
In a thermally insulated kitchen, an ordinary refrigerator is turned on and its door is left open. The temperature of the room:
A. remains constant according to the first law of thermodynamics B. increases according to the first law of thermodynamics C. decreases according to the first law of thermodynamics D. remains constant according to the second law of thermodynamics E. increases according to the second law of thermodynamics
An airplane is flying at a speed of 200 m/s in level flight at an altitude of 800 m. A package is to be dropped from the airplane to land on a target on the ground
At what horizontal distance away from the target should the package be released so that it lands on the target? A) 2.55 km B) 125 m C) 326 m D) 786 m E) 1.22 km